Selector arrangement for the selective call of telephone subscriber stations for the private and official exchange



Feb. 26, 1935. Q MOSER 1,992,389

SELECTOR ARRANGEMENT FOR THE SELECTIVE CALL OF TELEPHONE SUBSCRIBERSTATIONS FOR THE PRIVATE AND OFFICIAL EXCHANGE Filed March 29, 1954 2Sheets-Sheet 1 Fig.1.

T 1 In 12345628910 N Wi Off? /70 5e? Feb, 26, 1935.

0 MOSER SELECTOR ARRANGEMENT FOR THE SELECTIVE CALL OF TELEPHONESUBSCRIBER STATIONS FOR THE PRIVATE AND OFFICIAL EXCHANGE Filed March29, 1954 2 Sheets-Sheet 2 Patented Feb. 26, 1935 a 1,992,389

UNITED STATES PATENT OFFICE SEIJECTGR ARRANGEMENT FOR THE SE- IBECTWECALL. OF TELEPHONE 'SUB- JSQRIBER STATIONS .FOR THE PRIVATE AND OFFICIALEXCHANGE Otto Moser, Bern,.'S witzerland Application- March v29, 1934,Serial No. 718,056 I lnswitzerland March29, 1.933

'1 Claim. (01. 179-16) The present invention relates to a selectorartion is equipped with a small rotary selector W 'rangement for adirect call telephone system. similar to those used in connection withauto- .In direct call telephone systems push button matic telephonesystems. line finder devices have been employed for many The selector isoperated by the finger disc N.

= years. These :are subscribers-instruments which, When the number 1 isdialled on the finger disc, ,5 as expressed by their .name, are equippedwith i the contact arms .of the selector will move to the push buttonswitches which render it possible position 1; if the number 2 is dialledthe contact to call and to speak to any subscribers station arms of theselector will execute two steps and of the system by pressing on therespective press so on. In this manner the connection with the 1.0(button. desired'station will be .establishedover the variousEyery'single subscribers instrument must be lines connecting theindividual subscribers inprovided with so many push button switches asstruments. But since the finger disc N is also there are stations whichwish to be able to call needed for establishing connection with thepubone. another directly. If the system has five lic system, if this isof the automatic exchange 35 such stations there must'be providedforeach subtype, the coupling K between the finger disc and vscribersinstrument fiveswitchesandten switches the selector is arranged to becut out, when an if there are ten stations and so on. i If the systemexchange key Ais operated. The contact brushes "is connected to a publictelephone .system as "is of the selector at'the subscribers station willnot common to-day, the instrumentsare ,providedin then be advanced butwill remain in the position addition according to the number of serviceconof rest. It may now become necessary to speak 20 nections with one,two, threeormorepush button :with the internal stationsof the directcall sysswitches for making connection with the external tem whilstexternal calls are being sent or reexchange. If theexternal exchange isautomatic ceived. For thispurpose the coupling K between there must beadded also the rotary selectors. the finger disc and the selector isre-inserted as Therefore, on such line finder instruments, three soon asthe exchange key is brought into a hold- 25 different kinds of switchesare present; the push ing position, i. e., a position in which internalbutton switches for the direct call system, the calls may be madewithout disconnecting the inpush button switches for making connectionwith strument from the exchange. In order to permit the externalexchange and the rotary selectors. the operator to make any number ofinternal calls The operation of the instruments is, therefore, in thisposition of the exchange key the contact 30 tedious and the manufacturethereof is expensive. brushes of the selector are arranged to return Tosimplify matters special push button switches, to their position of resteach time the finger disc mechanically-coupled together have been proisoperated for an internal call. vided and to reduce the manufacturingcosts es- The manner in which these various operating pecially in recentyears it has been endeavoured conditions are attained willbe seen fromFigures 35 to construct switches as compactly and cheaply 2 and 3. Thefinger disc N is coupled with the line as possible. The number of pushbuttons has, finder system by means of the two pins b1 and b2 however,remained the same and, in spite of all of the coupling wheel. Ba. Whenthe telephone improvements, in order to locate these buttons is put downat rest a button HU presses through it is still necessary to constructapparatus varythe intermediary of a lever A upon a pawl C ing in sizeand arrangement according to the secured to the coupling wheel Ba, sothat this number of connections of the line finder system. pawl, whenthe finger disc turns the wheel Ba The present invention provides asystem in coupled therewith, will pass a pin D provided on which thepush button switches for permitting an inner coupling wheel B1.

direct calls are rendered unnecessary. The only The rotary selectorwill, therefore, remain in switches necessary are those for the externalits position of rest if the finger disc is operated exchange. The wholeline finder mechanismmay with the telephone on its hook. If thetelephone be located in the casing of a normal subscribers is removedthe lever A is withdrawn from the telephone instrument. Theinternalconstruction pawl C by the spring L and this pawl is moved of theinstruments has been simplified and the inwardsby spring E. As soon asthe finger disc 50 operation of the switches improved. is operated thepawl C pushes against the pin The invention is illustrated by way ofexample D so that the inner wheel B1 is also rotated and in theaccompanying drawings in which Fig. 1 in turn rotates the wheel W of therotary selecillustrates diagrammaticallya direct call system tor. Theselector brushes W1, W2, W3 will, ac-

5 embodying the invention. Each subscribers stacording to the numberdialled on the finger disc,

be adjusted to the contacts 1, 2, 3 etc. on the selector contact bank Mand thereby to the line of the selected subscribers station. The desiredconnection is thus established. Upon the return of the finger disc thewheel Ba will return into its position of rest. If, at the end of theconversation, the telephone is replaced a pawl S will be withdrawn fromthe teeth of the wheel W by means of an auxiliary arm F of the lever andthe wheel W and the brushes will be moved back into rest position by aspring 0.

It is also possible to make a number of internal calls successivelywithout replacing the telephone each time. When the finger disc is againoperated at the beginning of the rotary movement, the resilient mask Qcauses the coupling K to be pressed against the arm F which willwithdraw the pawl S from the teeth of the wheel W and the selector willturn as described into the position of rest. When the dialling iscontinued the selector brushes will again be adjusted according to thenumber dialled and soon.

For establishing or answering an external call an exchange key has to beoperated. This moves levers X and G so that the latter presses against apin J causing lever A to be pressed against the pawl C and the selectorremains in the position of rest.

If in connection with the external call an internal station has'to becalled the holding key has to be operated. The exchange key will be arethree exchange'keys each of which is connected to the external exchange.

To call the exchange an unoccupied key P is pressed down to position Zand if it is desired to make an internal call without disconnecting fromthe exchange the key V is then pressed. down. This will cause'the key Pto be raised to the position Y. This movement of the key P istransmitted by lever X to lever G so that the lever F is released asabove described and a number of internal calls may be made. Whilst thekey P is in the position Y it will maintain the connection to theexchange but without transmitting the internal conversation to theexchange.

To continue the conversation with the exchange, key P is again presseddown into position Z. When the telephone is replaced the key P willreturn to its original position.

I claim:

In a selector arrangement for a direct call telephone system, where a'dialling mechanism may be selectively connected for internal andexternal exchanges and in combination, a telephone rest arranged as apush button, a dialling mechanism comprising a driving shaft and acoupling disk having coupling pins and fast to this shaft, a finger diskcoupled to said shaft by said pins, a gear provided witha carrier pinloose on said shaft and a spring controlled pawl fast to said couplingdisk and adapted to be engaged with said carrier pin, a line findermechanism comprising a spring controlledauxiliary shaft, a toothedselector wheel meshing with the gear on the driving shaft and selectorbrushes both fast to this shaft and contact banks in reach of saidbrushes, external exchange keys and a holding and counter question keyand a lever arrangement adapted to establish the operating positions ofthe line finder mechanism .for the diiierent positions of the exchangekeys.

- OTTO MOSER.

